aberration:

Etymology: From Latin aberratio , wandering.

1. Generally speaking, any derivation or departure from the normal or usual course.

2. Sexually speaking, behavior deviating from what is considered normal sexual practices. In a more restrictive sense, any departure from genital-to-genital sexual-intercourse between a man and a woman .

3. In psychology, an abnormal alteration in one's state of mind.

4. In genetics, a deviation from the normal structure or number of chromosomes in an organism.

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